Imagine turning pollution into fuel — the gas that warms the planet transformed into the same alcohol you might find in a_hand sanitizer or biofuel pump. That is exactly what a team of scientists in South Korea has done.
Researchers at Sungkyunkwan University, led by Professor Hyoyoung Lee from the Department of Chemistry, have built a new catalyst that converts carbon dioxide into ethanol using electricity. A catalyst is a material that speeds up a chemical reaction without being used up itself — kind of like a helpful middleman in a factory assembly line.
Carbon dioxide, or CO₂, is the main greenhouse gas driving climate change. But scientists see it as more than just a problem — it is also a source of carbon that can be reshaped into useful products. Ethanol is especially valuable because it works as a renewable fuel, a disinfectant, a solvent, and a raw material for making other chemicals.
The challenge is that traditional systems for converting CO₂ into ethanol also make a lot of unwanted byproducts — like a recipe that produces several dishes instead of just one. These mixed results require extra energy to separate and purify, which makes the whole process less efficient and more costly.
Professor Lee's team solved this by designing a catalyst where copper and zinc atoms are placed directly next to each other on a carbon surface. At this incredibly tiny scale, the two metals act like teammates with complementary skills. Zinc prepares the key reaction ingredients — the intermediates — while copper focuses on building the carbon-carbon bonds needed to form ethanol. This teamwork guides the reaction more efficiently toward ethanol while cutting down on competing products.
In experiments using a membrane electrode assembly, a device that tests electrochemical reactions, the catalyst achieved 69 percent ethanol Faradaic efficiency. That means nearly 7 out of every 10 electrons flowing through the system went directly into making ethanol — a strong result compared to many existing methods.
The study was published in the journal Applied Catalysis B: Environment and Energy. The researchers say their work offers a new design strategy based on controlling chemical reactions atom by atom. With further improvements in areas like energy efficiency and long-term stability, this approach could eventually help turn captured CO₂ from power plants and factories into useful liquid fuels.
It is still early days, but the work points toward a future where the gas warming our atmosphere could be captured and reshaped into something society actually needs — fuel, cleaning products, and raw materials — all powered by electricity.